Roll crushing-mill.



PATENTED DEG. 13, 1904.

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T. L. n T. J. STURTEVANT.

ROLL GRUSI-ING MILL.

APPLIUATION FILED JUNE 1, 190.1..

1:0 MODEL.

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Patented December 13, 1904.

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THOMAS `LEGrGrE'lT STURTEVANT, F QUINCY, AND 'Fl-IUMA@ J. STURTE- VANT, 0F 'WELLESLIH MASSACHUSE'IIS.

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SPECIFICATION forming part of Letters Patent No. 777,448, dated December 13, 1904.

Application filed June 1, 19011. Serial No. 210,785. (No model.)

To all 'Ll/71,0711, it may concern.-

Be it known that we, THOMAS Lneen'r'r STURTEVANT, residing at Quincy, and TiioMAs J. STURTEVANT, residing at `Wellesley, in the county of Norfolk and State of Massachusetts, citizens of the United States, have invented certain new and useful Inniirovements in Roll Crushing-WENS, ofwhich the following' is a specification, reference being had therein to the accompanying drawings.

This invention relates to a roll crushingmill such as is shown in our application No. 180,215, filed November 7, 1903. In the crushing-mill of our said application the shafts carrying' the crushing-rolls are mounted in bearing-boxes, which are movably held in pedestals or carriers by springs which press against the said boxes in such a manner as to force the crushing-rolls toward each other, but which springs will yield more or less to cushion the rolls, and thus avoid objectionable jars or shocks. In order to provide for the convenient insertion or removal of the bearing-boxes from their carriers or pedestals, it is necessaryT to remove the pressure of the cushioning-springs against the said boxes, and the present invention relates to means whereby this may be effected.

In the accompanying drawings, Figure 1 is a longitudinal sectional view of a roll crushing-mill embodying the present invention. Figs. 2 and 3 are detail views illustrating slightly7 different forms of the invention from that shown in Fig. 1.

Referring to the drawings, 12 denotes the base or frame of the machine, on which in the present instance are adjustably mounted the open-topped carriers or pedestals 111 for the bearing-boxes 15, in which the shafts 16 of the erusl'iing-rolls 17 are mounted. Nests of powerful coil-springs 18 are placed in recessed portions of the bearing carriers or ped estals 1li, said springs pressing against the bearing-boxes 15 in such a manner as to force the crushing-rolls toward each other. In order to insert the bearing-boxes 15 in their carriers or'pedestals 14 or to remove said boxes from said carriers or pedestals when the removable covers with which the latter are provided have been taken oii', it is necessary 5o that the pressure of the springs 18 against said boxes be removed. This is ef'li'ccted in the construction shown in Fig. 1 by scrcwbolts 19, provided at their inner ends with disks or flanges Q0, against which the said springs bear, the outer ends of said bolts, which pass loosely through holes in the walls of the pedestals or carriers 14:, being screw-threaded for the reception of nuts 21, which can be turned to compress the springs 18, when de- 6o sired, for the purpose of relaxing or removing the pressure of said springs normally transmitted to the boxes 15 through the disks or fianges 20.

In the construction shown in Fig. 2 the 65 springs 18 bear directly against the bearingboX 15 and are confined in their chamber in the carrier or pedestal 14C by a screw-cap 22, provided with holes for the insertion of a suitable wrench or tool by which said screw-cap 7o maybe removed from the carrier or pedestal, thereby removing the pressure of the springs from the bearing-box.

In the construction shown in Fig. 3 the springs 18 are held in the chamber in the car- 7 5 rier or pedestal by a compressioirplate 23, held in place by screw-bolts 24;, tapped in por tions of the carrier or pedestal, so that by screwing out the said bolts the compression-plate may be adjusted or removed to relax or re- 8o move the pressure of the springs from the bearing-box 15.

ln the construction shown in Fig. 1 the pedestals or carriers 1li, in which the bearing-boxes are inserted, are adjustably mounted on the frame or base 12 of the machine, so that they may be moved back and forth by the screw tie-rods 25, provided with worm-wheels 2G, by which they may be turned from a wormshaft 27, the threaded ends of said screw tierod engaging nuts 28, suitably bolted to the said pedestals or carriers, as shown and described in our application hercinbefore referred to. It will .be understood, however,

adjustably mounted on the frames of the machines, as in the construction herein shown.

Having thus described our invention, ,We claim, and desire to secure by Letters Patent- 1. In a roll crushing-machine, the combination with a pair oi' crushing-rolls and shafts by which said rolls are carried, of bearingboxes for said shafts, open-"topped carriers or pedestals supporting said bearing-boxes and suitably recessed, said boxes being movably mounted in said carriers or pedestals, springs in the recessed portions of said carriers or pedestals, for yieldingly forcing said crushing-rolls toward each other, and means for relaxing or removing the pressure oi' said springs from said bearing-boxes When it is desired to remove said boxes from said open-topped carriers or pedestals, or insert said boxes therein.

2. In a roll crushing-machine, the combination with a pair of crushing-rolls and shafts by Which said rolls are carried, of bearingboxes for said shafts, open-topped carriers or pedestals supporting said bearing-boxes and suitably recessed, said boxes being movably mounted in said carriers or pedestals, springs in the recessed portions oi' said carriers or pedestals for yieldingly forcingsaid crushing-rolls toward each other, and means for re- In testimony Whereoil We aiix our signatures.

in presence of tWo Witnesses.

THOMAS LEGGET'I STURTEVANT. THOMAS J. STURTEVANT. Witnesses:

W. F. ELLIS, R. M. GAY. 

